Smoke-consuming furnace



(No Model.) I

G. P. N. BERGEN 8v 1. DOERFLER.

SMOKE GONSUMING FURNACE.

No; 425,730. Patented Apr. 15, 1890.

UNITED STATES PATENT OFFICE.

GEORG F. N. BERGEN AND IGNATZ DOERFLER, OF MILWAUKEE, XVISCONSIN.

SMOKE-CON SUMlN G FURNACE.

SPECIFICATION forming part of Letters Patent No. 425,730, dated April 15, 1890.

Application filed August 22, 1889- $erial No. 321,638. (No model.)

To all whom it may concern.-

Be'it known that we, GEORG F. N. BERGEN and IGNATZ DOEBFLER, of Milwaukee, in the county of Milwaukee, and in the State of WVisconsin, have invented certain new and useful Improvements in Smoke-Consuming Furnaces; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention relates to smoke-consuming furnaces; and it consists in certain peculiarities of construction and combination of parts to be hereinafter described with reference to the accompanying drawings and subsequently claimed.

In the drawings, Figure 1 represents a vertical longitudinal section of a furnace constructed according to our invention and in position for use with relation to aboiler; Fig. 2, a vertical transverse section of the same with parts broken away; Fig. 3, a detail front elevation of the furnace-door with the damper mechanism removed, and Fig. 4 a similar view with the damper in place.

Referring by letter to the drawings, Arepresents the walls, B the door, 0 the fire-box, D the grate, E the ash-pit, F the ash-pit door, and G the bridge, of our furnace. Back of the bridge is a combustion-chamber H, that communicates with a Vertical space I at the rear of a boiler J, and fines K in the boiler connect said space with a smoke-box L, that in turn connects with a stack M, the parts thus far described being fully illustrated in Fig. 1.

The door B of the fire-boxis preferably provided with dampercontrolled openings 1), and extended inward from this door are side walls tapered to have their lowest portions extend farthest into the fire-box, and supported by these walls is a cover-piece, the latter and said walls forming an air-deflecting hood N, that has its discharge near the surface of the grate D, whereby the air admitted to said fire-box comes into contact with the lowest portion of the fuel to cause the best possible combustion. The walls of the hood N on the door B converge toward each other in a rearward direction, and thus this air, after being heated by its passage I beneath the fire, finds an outlet through a line or flues d in the bridge G, as shown by the arrows in Fig. l; and, as shown in the same figure, these flues are tapered so as to gradually increase in area from top to bottom, whereby the escape of soot, ashes, &c., that may fall therein is facilitated.

The smoke and gases generated from the burning fuel in the fire-box O are met by the air that escapes at the top of the bridge G, and the ignition that takes place at this point extends back into the combustion-chamber H, whereby there is an even distribution of heat throughout the entire length of the boiler J, as well as a consumption of said smoke and gases.

The draft of the furnace is readily regulated by the adjustment of the dampers for the openings 1) c in the doors B F, and there being no deflectors at any point along the length of the boiler J the fire is not confined and directed against any particular point to endanger the safety of said boiler.

By passing the air through the ash-pit so as to raise its temperature prior to the mingling therewith of the products of combustion generated in the fire-box a better ignition and consumption of said products of combustion is obtained; but we are aware that this manner of heating air in the class of furnaces to which our invention relates is not broadly new; and we are also aware that an adjustable door for the fire-box has been employed in connection with a draft-flue, defiector, and hollow bridge having air inlet and outlet openings.

\Ve are further aware that fire-box doors have been provided with rear chambers having air inlet and outletopenings, and that deflectors have been placed on the rear sides of such doors to throw the air downward onto the surface of the fuel; but such we do not claim.

Having now fully described our invention,

5 what we claim as new, and desire to secureby Letters Patent, is-

In a furnace, the bridge provided with airflues, in combination with the fire-box door having an air-inlet and inwardly-extended I o converging side walls, the latter being tapered to have their lowest portions extend farthest into the fire-box, and a cover-piece supported by said walls to form therewith an air-deflect 

